The end of the world: I can add more points to my abilities

The end is coming. Zombies are rampant, animals mutate, and the remaining humans are reduced to blood food. A very small number of people have awakened their powers and can only struggle to survive. Chu Mu, on the other hand, obtained a system that allowed him to kill zombies to upgrade, and he could also add points to his own abilities! One day, while Chu Mu was killing and killing, he suddenly realized that he was invincible on this planet!